TERNA ENERGY S.A. informs the investors that, in compliance with article 4 par. 4 of the Regulation no. 2273/2003 of the Commission of the European Communities and according to article 16 of the Codified Law 2190/1920, as amended and currently in force, as well as by virtue of the Decision of the Regular General Assembly of its Shareholders dated 23.06.2008 and the Decision of the Board of Directors dated 23.06.2008, proceeded on May 31, 2010 through the member of the A.S.E. FORTIUS FINANCE S.A., with the purchase of 6,000 TERNA ENERGY's shares at an average price of 3.6866 euros per share and at with a total transaction value of 22,120.00 euros.